Keyboard



FIG. 1 is a perspective view of a keyboard showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showing of the remainder of the keyboard is included for the purpose of illustrating unclaimed portions of the article and forms no part of the claimed design. 

The ornamental design for a keyboard, as shown and described. 